:root{--bg:#0f172a;--bg2:#1e293b;--bg3:#273449;--line:#334155;--txt:#f1f5f9;--mut:#94a3b8;--acc:#22d3ee;--acc2:#a78bfa;--ok:#4ade80;--bad:#f87171;--warn:#fbbf24;--r:14px;--safe-b:env(safe-area-inset-bottom,0px);--safe-t:env(safe-area-inset-top,0px)}
*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}
html,body{margin:0;padding:0;background:var(--bg);color:var(--txt);font-family:-apple-system,"Segoe UI",Tahoma,"Noto Naskh Arabic","Noto Sans Arabic",Arial,sans-serif;font-size:15px;overscroll-behavior:none;height:100%}
body{position:fixed;inset:0;overflow:hidden}
button{font-family:inherit;color:inherit;border:0;background:none;cursor:pointer}
input{font-family:inherit}
#app{display:flex;flex-direction:column;height:100%;height:100dvh}
#topbar{display:flex;align-items:center;justify-content:space-between;padding:calc(8px + var(--safe-t)) 12px 8px;background:var(--bg2);border-bottom:1px solid var(--line);gap:10px}
.tier{display:flex;align-items:center;gap:8px;min-width:0}
.tier>span{font-size:26px}
#tier-name{font-weight:700;font-size:14px;white-space:nowrap}
#tier-progress{height:5px;width:110px;background:var(--bg3);border-radius:4px;margin-top:4px;overflow:hidden}
#tier-progress i{display:block;height:100%;width:0;background:linear-gradient(90deg,var(--acc),var(--acc2));transition:width .4s}
.counters{display:flex;align-items:baseline;gap:4px;font-weight:800;font-size:18px;white-space:nowrap}
.counters small{font-size:11px;color:var(--mut);font-weight:400}
.counters .sep{width:1px;height:16px;background:var(--line);margin:0 6px;align-self:center}
#view{flex:1;overflow-y:auto;overflow-x:hidden;-webkit-overflow-scrolling:touch;padding:12px 12px 20px}
#tabs{display:flex;background:var(--bg2);border-top:1px solid var(--line);padding:4px 4px calc(4px + var(--safe-b))}
#tabs button{flex:1;display:flex;flex-direction:column;align-items:center;gap:2px;padding:6px 0;font-size:11px;color:var(--mut);border-radius:10px}
#tabs button span{font-size:20px}
#tabs button.active{color:var(--acc);background:rgba(34,211,238,.08)}

/* ===== المختبر ===== */
.lab-slots{display:flex;gap:8px;justify-content:center;margin:4px 0 10px}
.slot{flex:1;max-width:120px;aspect-ratio:1/1.05;background:var(--bg2);border:2px dashed var(--line);border-radius:var(--r);display:flex;flex-direction:column;align-items:center;justify-content:center;gap:3px;padding:6px;text-align:center;position:relative;transition:.15s}
.slot.filled{border-style:solid;border-color:var(--acc);background:var(--bg3)}
.slot .f{font-size:17px;font-weight:800;direction:ltr}
.slot .n{font-size:11px;color:var(--mut);line-height:1.2;max-height:2.4em;overflow:hidden}
.slot .plus{font-size:28px;color:var(--line)}
.slot .x{position:absolute;top:-6px;left:-6px;width:22px;height:22px;border-radius:50%;background:var(--bad);color:#fff;font-size:13px;display:flex;align-items:center;justify-content:center}
.conds{display:flex;gap:6px;justify-content:center;flex-wrap:wrap;margin-bottom:10px}
.cond{display:flex;flex-direction:column;align-items:center;gap:1px;padding:7px 9px;border-radius:12px;background:var(--bg2);border:1px solid var(--line);font-size:10px;color:var(--mut);min-width:56px}
.cond span{font-size:20px;filter:grayscale(1);opacity:.6}
.cond.on{border-color:var(--warn);background:rgba(251,191,36,.12);color:var(--warn)}
.cond.on span{filter:none;opacity:1}
.go{display:block;width:100%;padding:14px;border-radius:var(--r);background:linear-gradient(135deg,var(--acc),var(--acc2));color:#0f172a;font-weight:900;font-size:17px;margin-bottom:12px;box-shadow:0 6px 20px rgba(34,211,238,.25)}
.go:disabled{opacity:.4;box-shadow:none}
.result{background:var(--bg2);border-radius:var(--r);padding:12px;margin-bottom:12px;border:1px solid var(--line);animation:pop .25s}
.result.ok{border-color:rgba(74,222,128,.5)}
.result.bad{border-color:rgba(248,113,113,.4)}
.result.hint{border-color:rgba(251,191,36,.5)}
.result .eq{direction:ltr;text-align:center;font-size:17px;font-weight:700;line-height:1.5;word-break:break-word}
.result .arrow{text-align:center;color:var(--warn);font-size:12px;margin-top:2px}
.result .dh{display:inline-block;padding:2px 8px;border-radius:8px;font-size:12px;margin-top:8px}
.dh.exo{background:rgba(248,113,113,.15);color:#fca5a5}.dh.endo{background:rgba(96,165,250,.15);color:#93c5fd}
.result .note{color:var(--mut);font-size:13px;line-height:1.6;margin-top:8px}
.result .reason{font-size:14px;line-height:1.6}
.newbadge{display:flex;flex-wrap:wrap;gap:6px;margin-top:10px}
.chip{display:inline-flex;align-items:center;gap:5px;padding:5px 10px;border-radius:20px;background:var(--bg3);font-size:13px;border:1px solid var(--line)}
.chip.new{background:rgba(74,222,128,.15);border-color:var(--ok);color:#bbf7d0;animation:pop .4s}
.chip b{direction:ltr;unicode-bidi:isolate}
.src{font-size:10px;color:var(--mut);text-align:left;margin-top:6px}
@keyframes pop{from{transform:scale(.95);opacity:0}to{transform:scale(1);opacity:1}}

.section-title{display:flex;align-items:center;justify-content:space-between;font-weight:700;font-size:14px;color:var(--mut);margin:14px 0 8px}
.section-title a{color:var(--acc);font-size:12px}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(78px,1fr));gap:7px}
.card{background:var(--bg2);border:1px solid var(--line);border-radius:12px;padding:8px 4px;display:flex;flex-direction:column;align-items:center;gap:2px;text-align:center;min-height:68px;position:relative;transition:.1s}
.card:active{transform:scale(.95)}
.card .f{font-weight:800;font-size:13px;direction:ltr;unicode-bidi:isolate;word-break:break-all;line-height:1.1}
.card .n{font-size:10px;color:var(--mut);line-height:1.2;max-height:2.4em;overflow:hidden}
.card.sel{border-color:var(--acc);background:rgba(34,211,238,.1)}
.card .st{position:absolute;top:3px;left:4px;font-size:8px;color:var(--mut)}
.card .fav{position:absolute;top:1px;right:4px;font-size:10px}
.card.c-element{border-bottom:3px solid #60a5fa}.card.c-acid{border-bottom:3px solid #f87171}.card.c-base{border-bottom:3px solid #a78bfa}.card.c-salt{border-bottom:3px solid #fbbf24}.card.c-oxide{border-bottom:3px solid #fb923c}.card.c-organic{border-bottom:3px solid #4ade80}.card.c-polymer{border-bottom:3px solid #34d399}.card.c-alloy{border-bottom:3px solid #94a3b8}.card.c-mixture,.card.c-mix,.card.c-mineral{border-bottom:3px solid #a16207}

.search{display:flex;gap:8px;margin-bottom:10px;position:sticky;top:-12px;background:var(--bg);padding:4px 0;z-index:2}
.search input{flex:1;padding:10px 12px;border-radius:12px;border:1px solid var(--line);background:var(--bg2);color:var(--txt);font-size:15px;outline:none}
.search input:focus{border-color:var(--acc)}
.filters{display:flex;gap:6px;overflow-x:auto;padding-bottom:6px;margin-bottom:6px;scrollbar-width:none}
.filters::-webkit-scrollbar{display:none}
.filters button{white-space:nowrap;padding:5px 11px;border-radius:20px;background:var(--bg2);border:1px solid var(--line);font-size:12px;color:var(--mut)}
.filters button.on{background:var(--acc);color:#0f172a;border-color:var(--acc);font-weight:700}

/* ===== الجدول الدوري ===== */
.ptable{display:grid;grid-template-columns:repeat(18,1fr);gap:2px;direction:ltr;font-size:9px}
.pcell{aspect-ratio:1;border-radius:3px;display:flex;flex-direction:column;align-items:center;justify-content:center;background:var(--bg3);opacity:.25;font-weight:700;line-height:1}
.pcell.have{opacity:1}
.pcell small{font-size:6px;font-weight:400}
.pcell.alkali{background:#dc2626}.pcell.alkaline{background:#ea580c}.pcell.transition{background:#2563eb}.pcell.post-transition{background:#0891b2}.pcell.metalloid{background:#7c3aed}.pcell.nonmetal{background:#16a34a}.pcell.halogen{background:#ca8a04}.pcell.noble{background:#db2777}.pcell.lanthanide{background:#9333ea}.pcell.actinide{background:#be185d}
.pcell.empty{background:none}
.plegend{display:flex;flex-wrap:wrap;gap:6px;margin:10px 0;font-size:11px}
.plegend span{display:inline-flex;align-items:center;gap:4px}
.plegend i{width:10px;height:10px;border-radius:2px;display:inline-block}

/* ===== الورقة السفلية ===== */
#sheet{position:fixed;inset:0;z-index:50}
#sheet.hidden{display:none}
.sheet-bg{position:absolute;inset:0;background:rgba(0,0,0,.6)}
.sheet-body{position:absolute;left:0;right:0;bottom:0;max-height:88%;overflow-y:auto;background:var(--bg2);border-radius:20px 20px 0 0;padding:16px 16px calc(16px + var(--safe-b));animation:up .25s}
@keyframes up{from{transform:translateY(40px);opacity:0}to{transform:none;opacity:1}}
.sheet-body h2{margin:0 0 2px;font-size:20px}
.sheet-body .formula{direction:ltr;text-align:right;font-size:26px;font-weight:900;color:var(--acc)}
.sheet-body .en{color:var(--mut);font-size:13px;direction:ltr;text-align:right}
.props{display:grid;grid-template-columns:1fr 1fr;gap:6px;margin:12px 0}
.prop{background:var(--bg3);border-radius:10px;padding:8px;font-size:12px}
.prop b{display:block;color:var(--mut);font-weight:400;font-size:10px}
.info{line-height:1.7;font-size:14px}
.actions{display:flex;gap:8px;margin-top:14px}
.actions button{flex:1;padding:12px;border-radius:12px;background:var(--bg3);font-weight:700;font-size:14px}
.actions button.primary{background:var(--acc);color:#0f172a}
.hintlist{margin-top:12px}
.hintlist .h{display:flex;align-items:center;gap:8px;padding:8px;background:var(--bg3);border-radius:10px;margin-bottom:6px;font-size:13px}
.hintlist .h b{direction:ltr}

/* ===== متفرقات ===== */
#toast{position:fixed;left:50%;bottom:calc(80px + var(--safe-b));transform:translateX(-50%) translateY(20px);background:#fff;color:#0f172a;padding:10px 16px;border-radius:30px;font-weight:700;font-size:14px;opacity:0;pointer-events:none;transition:.25s;z-index:60;max-width:90%;text-align:center}
#toast.show{opacity:1;transform:translateX(-50%)}
#splash{position:fixed;inset:0;background:var(--bg);display:flex;flex-direction:column;align-items:center;justify-content:center;z-index:100;gap:8px;transition:opacity .4s}
#splash.hide{opacity:0;pointer-events:none}
#splash .flask{font-size:72px;animation:bob 1.2s ease-in-out infinite}
#splash h1{margin:0;font-size:26px}
#splash p{color:var(--mut);margin:0}
#splash .bar{width:200px;height:4px;background:var(--bg3);border-radius:4px;overflow:hidden;margin-top:10px}
#splash .bar i{display:block;height:100%;width:30%;background:var(--acc);animation:slide 1s linear infinite}
@keyframes bob{0%,100%{transform:translateY(0)}50%{transform:translateY(-10px)}}
@keyframes slide{from{transform:translateX(300%)}to{transform:translateX(-300%)}}
.stat{display:flex;justify-content:space-between;padding:10px 12px;background:var(--bg2);border-radius:10px;margin-bottom:6px;font-size:14px}
.ach{display:flex;gap:10px;align-items:center;padding:10px;background:var(--bg2);border-radius:12px;margin-bottom:6px;opacity:.45}
.ach.got{opacity:1;border:1px solid rgba(74,222,128,.4)}
.ach span{font-size:26px}
.ach b{display:block;font-size:14px}.ach small{color:var(--mut);font-size:12px}
.logitem{padding:8px 10px;background:var(--bg2);border-radius:10px;margin-bottom:6px;font-size:13px}
.logitem .eq{direction:ltr;text-align:left;font-weight:700}
.logitem small{color:var(--mut)}
.btnrow{display:flex;gap:8px;flex-wrap:wrap;margin:8px 0}
.btnrow button{padding:10px 14px;border-radius:12px;background:var(--bg2);border:1px solid var(--line);font-size:14px}
.btnrow button.danger{border-color:var(--bad);color:var(--bad)}
.empty{text-align:center;color:var(--mut);padding:30px 10px;font-size:14px;line-height:1.7}
textarea.save{width:100%;height:80px;background:var(--bg3);color:var(--txt);border:1px solid var(--line);border-radius:10px;padding:8px;font-size:11px;direction:ltr}
.intro{line-height:1.8;font-size:15px}
.intro li{margin-bottom:4px}
.quick{display:flex;gap:6px;overflow-x:auto;padding-bottom:6px;scrollbar-width:none}
.quick::-webkit-scrollbar{display:none}
.quick .card{min-width:76px;flex:0 0 auto}